Sturdy, stylish cups make a positive impression, both aesthetically and environmentally. Each cup is constructed entirely of NatureWorks® Ingeo™ biopolymer, a renewable plant-based resin that most people can't tell apart from petroleum-based plastics. Rolled rim and stable base ensure sipping comfort and set-down stability. Old-Fashioned Cup. Cup Type: Old Fashioned Glass; Interior Volume Capacity: 9 oz; Material(s): NatureWorks® Ingeo™ Biopolymer Resin; Material Type: Sugarcane.